Lateral fluid container for hydraulic transmissions



D. GSSLER Nov. 30, 1937.

LATERAL FLUID CONTAINER' FOR HYDRAULIC TRANsMIss'IoNs Filed April 30,1936 Acq lillllllll/g patetica Nov. so, 1937' UNITED STATES PAT-ENToFFlcr.

LATERAL FLUID CONTAINER FOR HYDRAU- LIC TRANSMISSIONS Dietrich-Gssler,Heidenheim (Brenz), Germany Application April 30.1930, serial No. 11,247In Germany April 25; 1935 4 Claims.

. In rail and street vehicles the space between the motor shaft and therail, as well as they street, is decidedly limited since the motor andthe driving mechanism must be arranged as low as possible'in the Vehicleframe, with a most `favorable location .of the center of gravity. By

' the use of hydraulic couplings as changing mechanism, it is notpossible therein to arr-ange the container for the operating fluidunderneath the coupling. During the jolts and rocking which frequentlyoccur during operation, there exists, next to the already mentionedlimited clearance, also the danger that the rotating parts ofthecoupling will be immersed in lthe fluid and will thereby consumeunnecessary power. t

A second solution of -the problem of the limited clearance underneath-isthat of locating the conpump must .pump the operating fluid from the.l

lowest point up into the overhead container, from which the single stageof the hydraulic coupling would then befilled through the action ofgravity. This solution of the problem; however, has the disadvantagethat the leakage pump requires much power because it must pump theoperating uid rather high, as well as that the fluid supply in passingdownwardly from above must be conducted through a special checkarrangement, since otherwise the single rotor of the change speedcoupling can never be empty.

All these disadvantages are avoided through the present invention, andthe advantage of an especially effective cooling of the operating-huidobtained by reason of the novel container arrangement. The operatingfluid is stored in one or more laterally( arranged containers, and canbe .,forced into and drawn out of the several chambers by two pumps,which can be either gear pumps or centrifugal pumps.

An increased cooling eect is obtained from an additional enlargement ofthe surface of the container casing,- and from the forced circulation ofthe iluid againstj the casing walls. In order to be even more sparing inweight in vehicles, a part of the vehicle frame is formed as the fluidcontainer, so that no additional space whatever will be required. Invehicles which have an especially. low center of gravity, it is possibleAto obtain afconsiderably lower arrangement through a separation ofthe'two pumps, which normally lie together at the lowest point. i

In the drawing are shown schematically sever- 'al embodiments of theinvention.

. Figure 1 shows one embodiment shown partly as a transverse sectionalong the line l-l in Figure 2.

Figure 2 is a .longitudinal section along the line 2-2 in Figure 1.

Figure 3 shows a coupling in which the vehicle frame serves as acontainer, this being shown as employing two separated pumps.`

Referring to the drawing in detail, Figure 1A shows a hydraulic couplingA provided with a housing W and also a casing K for the two balancingcontainers B and C with walls V, which receive the fluid pumped theretothrough an overil'ow conduit D from the leakage pump E. The casing K isprovided with cooling ns K on its outer surface. For supplyingthecoupling rotors O, as well as P; there is also provided a distributingpump F which draws the operating uid out of the' containers- B and CAthrough the conduit H and pumpsit through the conduit J to the coupling.The pump drive, as shown in Figure 1, is common to the leakage pump Eand distributing pump F.' power therefor being transmitted thereto fromthe hydraulic coupling A through the bevel gearing G and the shaft g.Through an interconnecting conduit L a balance between the containers Band C is made possible. The fluid level lies at about the distance Xbeneath the shaft axis. The power from the driving motor is conducted tothe hydraulic coupling through the shaft M, while the shaft N deliversthe power on the secondary side.

In Figure-3 the coupling A is so arranged in the vehicle frame that thetwo longitudinally-extending frame members Y and Z can be utilizedsir'nul` taneously as the fluid containers B and C.V

This arrangement is especially suitable for vehicles with rather deeplylocated motors and couplings. In Figure 3 the distributing pump Q andleakage pump R are shown as separated from one another, and operated bytwo 'separate drive shafts Sand T. Instead of-this arrangement, however,the pump driving arrangement of Figure l may also be used, if desired,with the lateral fluid containers B and C within the .frame members Yand Z. The containers B and C of Figure 3 are interconnected, like thecontainers B and C in Figure 1, byfluid passages infront of and behindthe casing of the distributing pump Q so thatfiuid may ow between thetwo containers circuit including a hydraulic power transmitter,

an outer fluid container extending laterally of said power transmitteron opposite sides thereof, an inner fluid container arranged within saidouter fluid container, a pump for pumping fluid between'said outercontainer and said inner container, a second pump for pumping fluidbetween said inner container and said power transmitter, said inner andouter containers forming a fluid passageway therebetween incommunication with one of said pumps, and cooling means associated withsaid outer container adjacent said passageway.

3. In a hydraulic transmission, a hydraulic circuit including ahydraulic power transmitter, an

outer fluid container extending laterally of said power transmitter onopposite sides thereof, an inner fluid container arranged -within saidouter uid container, a pump for pumping fluid between said outercontainer and said inner container, and a secondpump for pumping fluidbetween said .inner container and said power transmitter, the bottomwall of said inner container being disposed approximately at the bottomof said power transmitter.

4. In a hydraulic transmission, a hydraulic circuit including ahydraulic power transmitter, an outer iiuid container extendinglaterally of said power transmitter on opposite sides thereof, an inneriiuid container arranged within said outer iiuid container, a pump forpumping uid between said outer container and said inner container, and asecond pump for pumping uid between said inner container and said powertransmitter, the lateral extent of at least one of said containersexceedingthe vertical extent thereof.

DIETRICH GssLER.

